Current Electricity Class 12 MCQs Questions with Answers

1. Nichrome or Manganin is widely used in wire bound standard resistors because of their

2. Two conductors of equal length and radii the ratio of 2 : 3 are; connected in parallel the source of electricity. The ratio of the velocity of electrons in the conductor be :

3. Combine three resistors 5 Q, 4.5 Q and 3 Q in such a way that the total resistance of this combination is maximum

4. The current which is assumed to be flowing in a circuit from positive terminal to negative, is called

5. A galvanometer acting as a volt meter will have with its coil.

6. Two cells of emf’s approximately 5 V and 10 V are to be accurately compared using a potentiometer of length 400 cm.

7. When a metal conductor connected to left gap of a meter bridge is heated, the balancing point

8. The heat sensitive device whose resistivity changes very rapidly with change of temperature is called a :

9. A current passes through a resistor. If K1 and K2 represent the average kinetic energy of the conduction electrons and the metal ions respectively then

10. In India electricity is supplied fordomestic use at 220 V. It is supplied at 110 V in U.S.A. If the resistance of a 60 W bulb use in India is R. the resistance of a 60 W bulb for use in USA will be:

11. A charge is moving across a junction, then

12. Siemen is the unit of:

13. Thermo electricity was discovered by:

14.  
In the series combination of two or more than two resistances

15. Constantan wire is used for making standard resistance, because it has

16. When no current is passed through a conductor,

17. The example of a non-ohmic resistance is:

18. To draw a maximum current from a combination of cells, how should the cells be grouped?

19. In parallel combination of n cells, we obtain

20. Drift velocity of electrons is due to